About that blocked punt. …

San Francisco’s blocked punt in the first quarter ended up being a mostly forgotten play when the Seahawks went on to beat the 49ers handily Sunday, 29-3.

At the time, though, it loomed as a potentially key play as it gave the 49ers the ball at the Seattle 33 with 12:21 left in the first quarter of what was a scoreless game.

And most frustrating to the Seahawks was how it happened as most of the Seattle players stood up at the snap, thinking they had heard a whistle, which allowed the 49ers to break easily through the line and block the kick.

“The whole punt team heard the whistle so we all kind of stopped,” said special teams captain Heath Farwell. “And unfortunately not all of us were able to get back in our stance in time.”

Farwell said the team never did figure out where the whistle came from. That they all heard it, though, proved to them that a whistle definitely came from somewhere.

“If it had cost us a touchdown or the game, it would have been pretty upsetting,” Farwell said, adding that he was also surprised Seattle wasn’t called for a false start, since so many players stood up, which would have negated the play.

The block ended up not costing the Seahawks as Seattle’s Earl Thomas picked off a deflected pass in the end zone on a third-and-goal play at the 5 to stop the drive and keep the 49ers scoreless.

And Farwell said the goal this week has been to learn from what happened.

“We just need to know to wait until the refs pull us out of our stance and not assume (a whistle is from the refs on the field),” Farwell said.